Sparkfun

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US$0.97
These LED holders accept a 10mm LED and mount into an 35/64" diameter hole.
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US$38.19
The SparkFun MIDI Shield board gives your Arduino-based device access to the antiquated, but still widely used and well supported MIDI communication protocol, so you can control synthesizers, sequencers, and other musical devices.
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US$7.33
This is a wireless transmitter to work with our 434MHz receiver. They can easily fit into a breadboard and work well with microcontrollers to create a very simple wireless data link.
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US$79.75

This rotary encoder has a 1024 pulse per rotation rotary encoder outputs gray code which you can interpret using a microcontroller and find out which direction the shaft is turning and by how much. This allows you to add feedback to motor control systems.

Delivery within 2-3 weeks
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US$4.13

This is a 1 foot communication cable extension that mates with the EM406 and EM401.

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US$2.79
A simple breakout PCB for the GP1A57HR photo interrupter. This PCB has three connections for PWR, GND, and Signal. When the gate is clear, SIG will be high (>4.9V). When the gate is blocked by a finger, writing utensil, food pellet, or anything else - SIG will go low (<0.4V).
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US$15.43
This is a cable that will allow you to access the pins on your car's OBDII connector. It has an OBDII connector on one end and a DB9 female serial connector on the other.  The overall length of the cable is 5'.
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US$1.33
This is a 5mm clear infrared LED. These devices operate between 840-850nm and work well for generic IR systems including remote control and touch-less object sensing.
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US$1.40
Ever wanted to see what's on that SIM card? Use these sockets in your next project to interface to any old SIM. 6-Pin standard connection. This is a surface mount socket, but it is large enough that it can be hand soldered.
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US$4.92
Mini Pliers. These are great little pliers! A must have for any hobbyist or electrical engineer. Crucial for inserting devices into bread boards and bending pins. 4" long.
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US$1.33
Turn the pot and the resistance changes. Connect VCC to an outer pin, GND to the other, and the center pin will have a voltage that varies from 0 to VCC depending on the rotation of the pot. Hook the center pin to an ADC on a microcontroller and get a variable input from the user!
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US$20.93

This is a basic breakout board for the FTDI FT232RL USB to serial to work with official Arduino and cloned 5V Arduino boards.

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US$4.92
This is a 8 pin dip programmed flash microcontroller chip. PICAXE is a neat entry-level microcontroller system that is relatively cheap to get started with. The chip is programmed with a simple serial connection and the BASIC development environment is free! 
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US$37.73
This is a contactless linear potentiometer used for liquid level and other harsh applications. This innovative sensor allows designers to retroactively assemble the sensor on the outside of pneumatic and hydraulic cylinders, which connects with the internal magnet of the cylinder.
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US$12.54
The SparkFun Snappable Protoboard is a large PCB crisscrossed with v-scored lines so that you can choose just how long and wide you need your custom protoboard to be. The Snapable Protoboard makes obtaining the perfect sized prototyping area for any given project as straight forward and uncomplicated as possible.
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